What problem does it solve? Engineering plans often drift from confirmed product intent, embed unconfirmed product decisions silently, and continue executing stale assumptions after implementation reality changes. This Skill enforces a single user-confirmed product authority, bounded decision audits, and evidence-driven plan rebasing so plans stay executable and aligned with what the user actually approved. ## Core Features & Use Cases - Single Product Authority: Reuses a canonical PRD's directly confirmed decisions when available, falling back to a protected decisions.md baseline only when no qualifying PRD exists, preventing duplicate sources of truth. - Executable Work Units: Every unit specifies a concrete change location, target object, action, resulting behavior, benefit, side effects, verification, and safe-stop boundary. - Phase Gates and Audits: Each material phase runs a Product Decision Delta audit after completion and a persisted Pre-Phase Plan Rebase Gate before starting, blocking execution until material plan changes receive explicit user approval. - Use Case: When asked to plan a multi-phase migration, the Skill creates docs/releases/<version>/<topic>/plan.md with an execution contract, references confirmed PRD decision IDs, and requires user approval before applying any material plan revision discovered during implementation. ## Quick Start Ask the agent to write an engineering plan for your next feature or refactor using the se-good-plan skill, providing the target release version and any existing PRD.
